AWS A5.7 ERCuAl-A2
ERCuAl-A2
ERCuAl-A2 filler metal is an iron-bearing aluminum bronze and is generally used for joining aluminum bronzes of similar composition: manganese, silicon bronzes, some copper-nickel alloys, ferrous metals and dissimilar metals. The most common dissimilar metal combinations are aluminum bronze to steel and copper to steel. This alloy also is used to provide wear- and corrosion-resistant surfaces.
Copper-aluminum weld metals are characterized by relatively high tensile strength, yield strength, and hardness. Depending upon the thickness or composition of the base metal, preheat may or may not be necessary.
Welding in the flat position is preferred. Welding in other positions can be done successfully with pulsed arc welding equipment and welder technique.
| Nominal Chemistry Composition (%) | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cu+Ag | Zn | Sn | Mn | Fe | Si | Ni+Co | P | Al | Pb | Ti | S | TOE |
| BAL | 0.20 max | – | – | 1.50 max | 0.10 max | – | – | 8.5-11.0 | 0.02 max | – | – | 0.50 max |
| Minimum Mechanical Properties | |
|---|---|
| Tensile Strength (psi) | 60,000 |
| Tensile Strength (MPa) | 414 |
| Brinell Hardness | 130-150 (3000kg load)* |
* Gas tungsten arc process only